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Lithium ion battery electrolyte, preparation method thereof and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of poor cycle stability and low safety, and achieve the effect of preventing decomposition and improving cycle stability and safety

Inactive Publication Date: 2018-07-27
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a lithium-ion battery electrolyte and a preparation method thereof and a lithium-ion battery, aiming to solve the problem of lithium batteries prepared with existing lithium-ion battery electrolytes under high-temperature and high-voltage conditions. Problems of poor cycle stability and low safety

Method used

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  • Lithium ion battery electrolyte, preparation method thereof and lithium ion battery
  • Lithium ion battery electrolyte, preparation method thereof and lithium ion battery
  • Lithium ion battery electrolyte, preparation method thereof and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Preparation of lithium-ion battery electrolyte: Under normal temperature and pressure, in an argon-filled glove box (oxygen and water content less than 0.1ppm), the ionic liquid 1-butyl-1-methylpiperidine bis(trifluoromethanesulfonate The acyl)imide salt and sulfolane are uniformly mixed according to the mass ratio of 6:4 to obtain a mixed solvent. Based on the mass, lithium difluorooxalate borate with a concentration of 0.5 mol / kg in the mixed solvent was added to the mixed solvent, and mixed uniformly to obtain 10 g of lithium-ion battery electrolyte.

[0046] Preparation of lithium-rich pole piece: Add lithium-rich layered oxide, conductive agent acetylene black, and binder polytetrafluoroethylene at a mass ratio of 8:1:1 to N-methylpyrrolidone (NMP), mix The positive electrode slurry is uniformly obtained, and then the slurry is uniformly coated on the aluminum foil, dried at a temperature of 70° C., and sliced ​​to obtain a lithium-rich electrode sheet.

[0047] P...

Embodiment 2

[0052] Under normal temperature and pressure, in a glove box filled with argon (oxygen and water content less than 0.1ppm), the ionic liquid 1-hydroxyethyl-3-methylimidazolium tetrafluoroborate and ethylene sulfite were mixed according to the mass Mix evenly with a ratio of 8:2. Based on the mass, add lithium difluorooxalate borate with a concentration of 0.4M / kg in the mixed solvent into the mixed solvent, and mix evenly to obtain 10 g of lithium-ion battery electrolyte.

[0053] The lithium-rich positive electrode was prepared according to the preparation method of the lithium-rich positive electrode in Example 1.

[0054] A battery was prepared according to the method for preparing the battery in Example 1.

[0055] After the prepared battery was left to stand for 24 hours, Shenzhen Fuyida constant temperature and humidity box was used to control the ambient temperature at 85°C, and Wuhan Landian CT2001A battery test system was used to test the cycle performance of the bat...

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Abstract

The invention discloses a lithium ion battery electrolyte, a preparation method thereof and a lithium ion battery. The lithium ion battery electrolyte is prepared from the following components: an ionic liquid, a lithium salt and a sulfone organic solvent. The electrolyte can form a stable and dense CEI film on the cathode surface in the charge-discharge cycle process, the electrode material can be effectively protected, and the electrolyte is prevented from being decomposed. Therefore, the electrolyte can significantly improve the cycle stability and safety of the lithium ion battery at hightemperature and voltage.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-ion battery electrolyte, a preparation method thereof, and a lithium-ion battery. Background technique [0002] With the population growing year by year and the shortage of fossil energy reserves, people urgently need a new alternative energy to solve the energy crisis. Rechargeable lithium-ion is widely used in electric vehicles, hybrid vehicles, 3C products and aerospace equipment due to its high energy density, excellent rate performance and long cycle life. However, the current lithium-ion battery technology still has some challenging issues, such as poor cycle stability at high temperature and high voltage and low safety in high temperature environment (above 55 °C). [0003] The electrolyte is an ionic conductor that conducts electricity between the positive and negative electrodes of the battery, and its performance greatly affects the performance of the bat...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0569H01M2300/0037Y02E60/10
Inventor 李翠华董良梁福晓刘剑洪朱才镇
Owner SHENZHEN UNIV
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